Apparently this command is for when you're working either in a layout or in a floating viewport (i.e. you double-clicked inside the boundary of a viewport). Don't try to access it in modelspace, 'cause it won't work there.

If you're in a floating viewport and run SPACETRANS, you're prompted to enter a paperspace distance, which is then converted (based on the viewport scale) into the equivalent distance in modelspace.

If you're in a layout, you have to pick a viewport first, then enter a modelspace distance to be converted into a paperspace size.

SPACETRANS can be (and usually is) used transparently, as 'SPACETRANS. (Notice the apostrophe before the command name.) Using a command transparently means you enter it instead of a number when prompted for a height or length.

For example, here's how you might use SPACETRANS to calculate a text height:

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That is a slick trick, Kate. To take this trick a step further, I suggest modifying the PGP file and create a command alias like ST (or whatever) so that you don't have to spell out 'SPACETRANS each time.